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Nickel Boron BCG - Top 3 Reasons Your AR15 Needs One If you've heard about Nickel Boron Bolt Carrier Groups and wondered what all the fuss was about, you've come to the right place!What are the advantages of a Nickel Boron BCG?Are they worth the money?Do I need one in my AR15 or my AR Pistol?Below are the top 3 reasons your AR15 might need one. Reason #1 - Reliability Of all AR15 parts, th …